US Patent: 1,407,578
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Wrench
Self Adjustable Wrench
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Patent Dates:
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| Applied: |
Apr. 02, 1921 |
| Granted: |
Feb. 21, 1922 |
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Patent Pictures:
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Frederic P. Robert patented February 21, 1922 |
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Description: |
| The wrench consists of a fixed jaw with a curved face, a movable jaw at an oblique angle, linkage between the two which keeps the gripping surface of the movable jaw approximately parallel to the curved fixed jaw, and a contractile spring in the linkage which tends to close the jaws.
Initially produced by the inventor; most of those found were produced by the Hoe Corporation.
Patent nos. 1,515,618 and 1,681,184 are later refinements. |
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